
Contents
25.1.02
AOAC Official Method 923.02
Carbon Dioxide (Total) in Baking Powders: Gasometric Determination
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Published:January 2023
Cite
Carbon Dioxide (Total) in Baking Powders: Gasometric Determination', in Dr. George W Latimer, Jr. (ed.), Official Methods of Analysis of AOAC INTERNATIONAL, 22nd Edition (
Extract
First Action 1923
Final Action
(Applicable to baking powders containing added CaCO3.)
Reagent
Displacement solution.—Dissolve 100g NaCl or Na2SO4·10H2O in 350 mL H2O. Add ca 1 g NaHCO3 and 2 mL methyl orange (0.5% aqueous solution), and then enough H2SO4 (1 + 5) or HCl (1 + 2) to make the acid solution a decidedly pink color. Stir until all CO2 is removed. This solution is used in gas-measuring tube and leveling bulb and seldom needs replacement.
...
Apparatus
Chittick apparatus.—Figure 923.02 . Connect decomposition flask, A, by glass T-tube, B, provided with stopcock, C, to graduated gas-measuring tube, D, connected in turn with leveling bulb, E. For A always use 250 mL wide-mouth extraction flask of Pyrex or other resistant glass fitted with 2-hole rubber stopper. Through one hole pass extended tip of 25 mL buret, F, and through the other, pass a glass tube of same diameter as the connecting T-tube. Use a buret graduated in mL at 20°C, numbered at 5 mL intervals, and fitted with extra-long tip bent to pass through rubber stopper. Connect glass tube leading from decomposition flask to T-tube with rubber tubing to permit rotation of flask. Use gas-measuring tube graduated in mL at 20°C with 0 mark at the point 25 mL below top marking to allow for graduating upward from 0 to 25 mL and downward from 0 to 200 mL. Connect gas-measuring tube to ca 300 mL leveling bulb with long rubber tube.
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